About this game

Expanded form to number

Expanded form to number: a free Grade 2 math game for ages 7-8. Kids put hundreds, tens and ones back together into one number. Each round brings 10 fresh questions with new numbers; instructions are read aloud and every answer is checked.

How it plays and why it helps

Hundreds, tens and ones usually get taken apart in second grade. Expanded form to number puts them back together. Each card shows a sum like 400 + 20 + 8, with every place filled by a digit from 1 to 9, and your child types the number it makes. New numbers come on every card. Ten cards make a round in this Grade 2 game; each answer is checked, with a hint ready.

Expanded form shows what each digit is worth. The 400 is 4 hundreds, the 20 is 2 tens, the 8 is 8 ones, and written as one number they make 428. The hint gives the order to write them in: hundreds, tens, then ones. Since no card has a zero, each digit lands in its own place without gaps.

Zeros can stay behind. Copying 400, then 20, then 8 gives 400208, six digits for a number in the hundreds. Ask, "How many digits does a hundreds number need?" Then line up the three parts on top of each other. Praise it: "You put each digit in its own place."

Aligned with

  • 2.NBT.A.3 Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.

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